OK, Moore's law has officially been replaced by Musk's law.That's no joke.
To maintain their 50% annual growth, Tesla has to grow their number of Gigafactories at the same rate (give or take a bit due to improved efficiencies).
So to maintain an annual growth of 50%, the number of Gigafactories has to double every 21 months.
As I wrote a few weeks ago, I expect the location for GF5 to be announced before the end of Q2.